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THIS WAS THE FIRST MODEL MADE BY MARANTZ NO SERIAL NUMBER IT WAS A PROTOTYPE APP-1 ( TRULY FIRST ONE MADE ) (see pics). Tuner professionally aligned. All el ectrolytic capacitors have been replaced with Elna and Nichicon Gold capacitors, DC offset and Bias have been adjusted to factory specs and all solder joints re-soldered, unit serviced to new condition.
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